Re: die grinder in CNC router

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "echnidna <echnidna@y...>"
<echnidna@y...> wrote:

> Dave.
> Have a think about using a 4" angle grinder. They run about 10000

to 12000 rpm which is adequate for a router bit. For a chuck use a
piece of steel shafting bored 1/4" one end with grub screw to lock
the router cutter. The other end bored and tapped to suit the
threaded shaft of the angle grinder. The accuracy of the cutter and
spindle centre is not as important as the repeatability of the cut.

>
> It might not be possible to achieve high accuracy location of the

1/4" hole in relation to the spindle centre line. But I dont think
this is a major problem as it may be possible to set up a 2 flute
cutter using a dial indicator to align both cutter edges into the
same plane if the hole is slightly off centre. Otherwise use a single
flute cutter.

>
> Regards
> Bob
> The Angle grinder was my first thought on the subject but I have

been taking my time while I looked around for other solutions. The
beauty of the angle grinder idea is that its a compact package and no
way would you miss running a good aircompressor to death and all that
air powered die grinder noise. No way would I consider that approach.
The set screw putting the endmill offcenter problem is not a real
problem at all. The ordinary r-8 endmill holders that i use in my
mill always place a higher chipload on the one side than the other
and causes no trouble... Yes I agree the anglegrinder is a good
solution..
If I were extremely pressed for space I would buy a right angle
air powered die grinder and gut the thing for the right angle and the
collet and adapt that assemblage to a shaft running over to my
electric router.. Yea I would have a few maintenance problems because
of minute misalignments but it would work well for weeks at a time if
casually assembled and much longer if very carefully aligned.Be
really nice if a flex shaft capable of handling the torque and rpm
were used to couple the components.
My opinion
Alphawolf

>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Dave Lantz <dlantz@a...>

wrote:

> > I've allready got a dewalt trim router, but it is just too tall

for my

> > application, due to the design being upside down (the z-axis

assembly has to

> > 'tuck' up into the machine)
> > here is some more info on what the router would probably do:
> > 1/8"-1/4" hardwoods (probably maple mostly), 1/16"-1/8" deep,

with small

> > bits (1/16"-1/8" typ.) on a small scale router (x:9,y:12,z:1.5),

this would

> > mostly an "art" router for making wooden boxes, and an occasional

brass

> > pressing plate (not very deep cut at all--at most .05", and if

that became

> > a problem, i could simply use the router to etch away resist and

then acid

> > bath the plate)
> >
> > speed isn't important, i can go slow if need be
> >
> > ive got a farely sizable compressor, not sure what H.P., but it

pulls nearly

> > 20 amps at 115 V
> >
> > the die cutter ive looked at is: Item #: 35943-2VGA, an

ingersall-rand.

> > wouldn't this be roughly equivalent to a dremmel tool?
> >
> > noise could be a problem, but i eventually plan on enclosing the

router in a

> > sound dampening box, with a shop-vac attachment for dust.
> >
> > the router has to be portable.
> >
> > SO, i could use the trim router if i could find a right angle

attachment for

> > it. I used to have a right angle attachment for my hand drill,

but Im

> > assuming that wouldn't take lateral load very well... does anyone

know of a

> > right angle collet i could attach to a trim router?---Dave L.